"use strict";

var setPrototypeOf = require("es5-ext/object/set-prototype-of")
  , contains       = require("es5-ext/string/#/contains")
  , d              = require("d")
  , Symbol         = require("es6-symbol")
  , Iterator       = require("./");

var defineProperty = Object.defineProperty, ArrayIterator;

ArrayIterator = module.exports = function (arr, kind) {
	if (!(this instanceof ArrayIterator)) throw new TypeError("Constructor requires 'new'");
	Iterator.call(this, arr);
	if (!kind) kind = "value";
	else if (contains.call(kind, "key+value")) kind = "key+value";
	else if (contains.call(kind, "key")) kind = "key";
	else kind = "value";
	defineProperty(this, "__kind__", d("", kind));
};
if (setPrototypeOf) setPrototypeOf(ArrayIterator, Iterator);

// Internal %ArrayIteratorPrototype% doesn't expose its constructor
delete ArrayIterator.prototype.constructor;

ArrayIterator.prototype = Object.create(Iterator.prototype, {
	_resolve: d(function (i) {
		if (this.__kind__ === "value") return this.__list__[i];
		if (this.__kind__ === "key+value") return [i, this.__list__[i]];
		return i;
	})
});
defineProperty(ArrayIterator.prototype, Symbol.toStringTag, d("c", "Array Iterator"));